Siva Prasad, Aviraboina, and Bollikonda Satyanarayana. “Direct Sulfamidation of Alcohols Using Magnetically Recoverable Pd Fe3O4 As the Catalyst”. Asian Journal of Chemistry, vol. 24, no. 12, Aug. 2012, pp. 5503-6, https://asianpubs.org/index.php/ajchem/article/view/9916.